Consider the dynamical systems generated by the differential equations dx/dt = f(x), t ∈ ℝ¹, x ∈ ℝⁿ and by the difference equations x(t + 1) = f(x(t)), t ∈ ℤ, x ∈ ℝⁿ Here, ℝⁿ is a Euclidean space, ℤ is the set of integers, and f (x) is a vector-function: ℝⁿ → ℝⁿ.